Quantum 7, 1190 (2023). https://doi.org/10.22331/q-2023-11-28-1190 We develop a general perturbative theory of finite-coupling quantum thermometry up to second order in probe-sample interaction. By assumption, the probe and sample are in thermal equilibrium, so the probe […]
Quantum 7, 1189 (2023). https://doi.org/10.22331/q-2023-11-28-1189 In light of recently proposed quantum algorithms that incorporate symmetries in the hope of quantum advantage, we show that with symmetries that are restrictive enough, classical algorithms can efficiently emulate […]
Quantum 7, 1188 (2023). https://doi.org/10.22331/q-2023-11-22-1188 Previously proposed quantum algorithms for solving linear systems of equations cannot be implemented in the near term due to the required circuit depth. Here, we propose a hybrid quantum-classical algorithm, […]
Quantum 7, 1187 (2023). https://doi.org/10.22331/q-2023-11-21-1187 Single photon detector(SPD) problems arise in most quantum tasks, especially for measuring states going through high-lost channels. They are particularly prominent in quantum key distribution(QKD), which could be the most […]
Quantum 7, 1186 (2023). https://doi.org/10.22331/q-2023-11-21-1186 Quantum algorithms are getting extremely popular due to their potential to significantly outperform classical algorithms. Yet, applying quantum algorithms to optimization problems meets challenges related to the efficiency of quantum […]
Quantum 7, 1185 (2023). https://doi.org/10.22331/q-2023-11-20-1185 Stabilizer simulation can efficiently simulate an important class of quantum circuits consisting exclusively of Clifford gates. However, all existing extensions of this simulation to arbitrary quantum circuits including non-Clifford gates […]
Quantum 7, 1184 (2023). https://doi.org/10.22331/q-2023-11-20-1184 We propose a quantum error mitigation strategy for the variational quantum eigensolver (VQE) algorithm. We find, via numerical simulation, that very small amounts of coherent noise in VQE can cause […]
Quantum 7, 1183 (2023). https://doi.org/10.22331/q-2023-11-14-1183 Fault-tolerant quantum computing requires classical hardware to perform the decoding necessary for error correction. The Union–Find decoder is one of the best candidates for this. It has remarkably organic characteristics, […]
Quantum 7, 1182 (2023). https://doi.org/10.22331/q-2023-11-14-1182 Measurements take a singular role in quantum theory. While they are often idealized as an instantaneous process, this is in conflict with all other physical processes in nature. In this […]
Quantum 7, 1181 (2023). https://doi.org/10.22331/q-2023-11-14-1181 In this paper we provide a framework for combining multiple quantum simulation methods, such as Trotter-Suzuki formulas and QDrift into a single Composite channel that builds upon older coalescing ideas […]
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